NAME
setpriv - run a program with different Linux privilege settingsSYNOPSIS
setpriv [options] program [arguments]DESCRIPTION
Sets or queries various Linux privilege settings that are inherited across execve(2).OPTIONS
--clear-groupsClear supplementary groups.
Dump the current privilege state. This option
can be specified more than once to show extra, mostly useless, information.
Incompatible with all other options.
Set supplementary groups. The argument is a
comma-separated list of GIDs or names.
Set the inheritable capabilities, ambient
capabilities or the capability bounding set. See capabilities(7). The
argument is a comma-separated list of +cap and
-cap entries, which add or remove an entry respectively.
cap can either be a human-readable name as seen in
capabilities(7) without the cap_ prefix or of the format
cap_N, where N is the internal capability index used by Linux.
+all and -all can be used to add or remove all caps.
The set of capabilities starts out as the current inheritable set for
--inh-caps, the current ambient set for --ambient-caps and the
current bounding set for --bounding-set.
Note the following restrictions (detailed in capabilities(7)) regarding
modifications to these capability sets:
•A capability can be added to the
inheritable set only if it is currently present in the bounding set.
•A capability can be added to the
ambient set only if it is currently present in both the permitted and
inheritable sets.
•Notwithstanding the syntax offered by
setpriv, the kernel does not permit capabilities to be added to the
bounding set.
Preserve supplementary groups. Only useful in
conjunction with --rgid, --egid, or --regid.
Initialize supplementary groups using
initgroups3. Only useful in conjunction with --ruid or
--reuid.
List all known capabilities. This option must
be specified alone.
Set the no_new_privs bit. With this bit
set, execve(2) will not grant new privileges. For example, the
set-user-ID and set-group-ID bits as well as file capabilities will be
disabled. (Executing binaries with these bits set will still work, but they
will not gain privileges. Certain LSMs, especially AppArmor, may result in
failures to execute certain programs.) This bit is inherited by child
processes and cannot be unset. See prctl(2) and
Documentation/prctl/no_new_privs.txt in the Linux kernel source.
The no_new_privs bit is supported since Linux 3.5.
Set the real, effective, or both GIDs. The
gid argument can be given as a textual group name.
For safety, you must specify one of --clear-groups, --groups,
--keep-groups, or --init-groups if you set any primary
gid.
Set the real, effective, or both UIDs. The
uid argument can be given as a textual login name.
Setting a uid or gid does not change capabilities, although the
exec call at the end might change capabilities. This means that, if you are
root, you probably want to do something like:
setpriv --reuid=1000 --regid=1000 --inh-caps=-all
Set or clear securebits. The argument is a
comma-separated list. The valid securebits are noroot,
noroot_locked, no_setuid_fixup, no_setuid_fixup_locked,
and keep_caps_locked. keep_caps is cleared by execve(2)
and is therefore not allowed.
Keep, clear or set the parent death signal.
Some LSMs, most notably SELinux and AppArmor, clear the signal when the
process' credentials change. Using --pdeathsig keep will restore the
parent death signal after changing credentials to remedy that situation.
Request a particular SELinux transition (using
a transition on exec, not dyntrans). This will fail and cause setpriv
to abort if SELinux is not in use, and the transition may be ignored or cause
execve(2) to fail at SELinux’s whim. (In particular, this is
unlikely to work in conjunction with no_new_privs.) This is similar to
runcon(1).
Request a particular AppArmor profile (using a
transition on exec). This will fail and cause setpriv to abort if
AppArmor is not in use, and the transition may be ignored or cause
execve(2) to fail at AppArmor’s whim.
Clears all the environment variables except
TERM; initializes the environment variables HOME, SHELL,
USER, LOGNAME according to the user’s passwd entry; sets
PATH to /usr/local/bin:/bin:/usr/bin for a regular user and to
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin for root.
The environment variable PATH may be different on systems where
/bin and /sbin are merged into /usr. The environment
variable SHELL defaults to /bin/sh if none is given in the
user’s passwd entry.
Display help text and exit.
Print version and exit.
NOTES
If applying any specified option fails, program will not be run and setpriv will return with exit status 127.EXAMPLES
If you’re looking for behavior similar to su(1)/runuser(1), or sudo(8) (without the -g option), try something like:AUTHORS
Andy <[email protected]>LutomirskiSEE ALSO
runuser(1), su(1), prctl(2), capabilities(7)REPORTING BUGS
For bug reports, use the issue tracker at <https://github.com/util-linux/util-linux/issues>.AVAILABILITY
The setpriv command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.2022-05-11 | util-linux 2.38.1 |